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Navigational gear worldwideWAAS is a series of fixed towers that send out correction signals. In simplified terms if you are near one, it can tell your GPS 'satellite #7 is reading off by this amount, adjust accordingly' - this can be done post process too by downloading the info from the nearest when you get back.

How can I hike across the Grand Canyon if I don't have a backcountry permit?I suggest a better question title like "What are my options for hiking the corridor of the Grand Canyon when the permits are already full?" or the like. This is the nature of your question, but the title is more general - and the answer to that is: Yes, there are alternatives to established campgrounds - just not in the corridor (where you want to hike).